A187703 - OEIS

A187703

Number of (n+1) X (n+1) 0..4 arrays with each 2 X 2 subblock off diagonal and antidiagonal nonsingular and the array of 2 X 2 subblock determinants antisymmetric about the diagonal and antidiagonal.

113, 31461, 1718, 875696, 4612

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OFFSET

1,1

COMMENTS

Column 4 of A187705.

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for 4 X 4

..0..2..1..1....0..0..1..0....2..2..4..2....0..3..0..0....4..3..4..4

..0..1..1..1....3..2..1..0....2..2..2..1....0..1..1..2....4..3..3..3

..1..1..1..0....2..2..1..2....2..4..4..4....3..3..3..3....3..3..3..4

..3..3..4..0....4..4..1..2....2..4..3..3....0..0..1..1....1..1..0..0

CROSSREFS

Cf. A187705.

Sequence in context: A218241 A152496 A176825 * A352400 A329105 A304324

Adjacent sequences: A187700 A187701 A187702 * A187704 A187705 A187706

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 12 2011

STATUS

approved